Am 08.11.2016 um 16:47 schrieb cpolish@xxxxxxxxxxxx:
> On 2016-11-07 14:35, Bernard Fay wrote:
>> Hi,
>>
>> We have a virtual environment based on XenServer. In this environment I
>> defined a template for CentOS 7 servers.
>>
>> I would like to start a script a boot time to complete the configuration of
>> new VMs based on this template. How can I have a script started before any
>> login prompt to ask question to the user to complete the configuration such
>> as hostname, IP address, etc?
>
> Hi Bernard,
>
> My first impulse was "don't!", and that's probably the best
> advise. A popular model is that the "firstboot" package takes
> care of this at the first user login, and *nix systems sort of
> depend on this "logged in users do stuff" model.
>
> Even better, use ansible, cfengine, chef, or puppet to automate
> the task of setting things up. This is the _best_ solution and
> you will eventually come back to it.
>
> But, the darker, cynical part of my brain, the part that says
> "what, you're cutting down on coffee?" part, said "sure you
> can". Here's how it _could_ be done.
>
> DON'T DO THIS. TURN BACK NOW.
>
> Replace /sbin/init with a shell script that does what you want.
> It will be the first userland process started, have the console
> for I/O, and run as root. At completion, restore the original
> /sbin/init and reboot. Leave no traces behind. Do not document
> your awful hack, others will use your words against you.
:-) ... kernel parameter init=/root/yourscript
https://www.kernel.org/doc/Documentation/kernel-parameters.txt
--
LF
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